Science Grade 9: Types of Volcanoes Quiz

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Questions and Answers

What characteristic defines shield volcanoes?

They are built almost entirely of fluid lava flow. (correct)

They are characterized by significant pyroclastic materials.

They frequently erupt with explosive force.

They are steep and cone-shaped.

How does the composition of lava from shield volcanoes affect their eruption style?

The lava is fluid, resulting in non-explosive, gentle eruptions. (correct)

The presence of pyroclastic materials makes the eruptions highly explosive.

The lava is thick and viscous, leading to explosive eruptions.

The eruptions are violent due to the accumulation of volcanic gases.

Which classification includes volcanoes that have erupted within the last 10,000 years?

Dormant volcanoes

Extinct volcanoes

Inactive volcanoes

Active volcanoes (correct)

Which of the following is NOT a feature of shield volcanoes?

Steep slopes Signup and view all the answers

What can lead to explosive eruptions in shield volcanoes?

Volcanic gases mixing with water in the vent Signup and view all the answers

What distinguishes shield volcanoes from stratovolcanoes?

Shield volcanoes mainly produce fluid lava flows. Signup and view all the answers

What is the primary reason why shield volcanoes are considered relatively safe?

They typically have gentle eruptions. Signup and view all the answers

Which volcano is mentioned as one of the largest shield volcanoes?

Mauna Loa Signup and view all the answers

What is the main characteristic of a cinder cone volcano?

It is built from solidified lava fragments ejected from a single vent. Signup and view all the answers

Which of the following features is NOT part of a volcano's structure?

Seismic Zone Signup and view all the answers

How is magma transported to the crater of a volcano?

Through a conduit that connects the magma chamber to the crater. Signup and view all the answers

What is formed around the vent of a cinder cone volcano after eruptions?

A circular or oval cone of cinders. Signup and view all the answers

Which component of a volcano is primarily responsible for the eruption of gases and ash?

Main Vent Signup and view all the answers

What distinguishes a cinder cone volcano from other types of volcanoes?

It is the simplest type built from solidified lava ejected from a single vent. Signup and view all the answers

What is the role of the magma chamber in a volcano?

It stores and deposits molten rock before eruption. Signup and view all the answers

Which of these is primarily expelled during a volcanic eruption?

Lava, ash, and gases. Signup and view all the answers

What characteristic defines an inactive volcano?

It shows no signs of volcanic activity for over 10,000 years. Signup and view all the answers

Which type of volcano is classified as potentially active?

One that has no records of volcanic activity but appears young. Signup and view all the answers

What is a key indicator that an inactive volcano may not erupt again?

Signs of weathering and erosion. Signup and view all the answers

What type of eruption is characterized by hot rocks coming into contact with water?

Phreatic or hydrothermal eruption. Signup and view all the answers

What is a characteristic feature of a phreatic eruption?

Short-lived ash columns. Signup and view all the answers

How many volcanoes in the country are classified as active?

Twenty-four. Signup and view all the answers

What usually happens to a volcano that is classified as inactive?

Magma supply is cut off. Signup and view all the answers

Which of the following describes the relationship between eruptive types of volcanoes and magma water content?

They are classified as wet or dry depending on the magma's water content. Signup and view all the answers

Study Notes

Science Grade 9

Quarter 3 - Earth and Space Module 1
Topic: Different Types of Volcanoes

Module Information

Curriculum: Department of Education (DepED), Philippines
Module: CO_Q3_Science 9_Module 1
Edition: 2020
Intended for: Grade 9 Science students

Volcano Description

A volcano is an opening in the Earth's mantle from which lava, volcanic ash, and gases escape.
Magma and other volcanic materials originate from molten materials beneath the surface.
Volcanic activity encompasses any magma movement towards or onto the Earth's surface.

Parts of a Volcano

Summit: Highest point of the volcano.
Slopes (or Flanks): Sides of the volcano radiating from the main vent.
Base: Lower, outer part of the volcano.
Magma Chamber: Region beneath the vent where magma is stored.
Vent: Opening where magma, ash, and gases erupt.
Crater: Funnel-shaped or bowl-shaped hollow at the top of the vent.
Side Vent: Smaller outlet for magma escape.
Conduit: Underground central tube or pipe connecting the magma chamber to the vent.
Lava: Molten rock that flows onto the Earth's surface.
Ash and Gas Cloud: Mixture of rock, minerals, glass particles, and gases released during an eruption.

Volcano Classification

Structure: Cinder cones, shield volcanoes, and composite volcanoes.
Activity: Based on the frequency and type of eruptions.
Cinder Cone Volcanoes: Simplest, built from ejected lava fragments. Circular or oval cone shape with steep slopes. Most common type. Examples include Taal and Smith volcanoes in the Philippines.
Shield Volcanoes: Broad, low-sloped volcanoes formed from fluid lava flows. Examples include Mauna Loa.
Composite Volcanoes (or stratovolcanoes): Large, steep-sided volcanoes built from alternating layers of lava flows and pyroclastic materials. They are often more explosive than other types. Examples include Mount Mayon, Mount Fuji, and Mount Rainier.

Volcanic Eruptions

Phreatic: Eruption due to water-magma contact. Short-lived, characterized by ash columns.
Phreatomagmatic: Violent eruption from water-magma interaction, often producing ash and high-speed ejected materials.
Strombolian: Periodic, weak-to-violent eruption characterized by fountain lava, like the Irazu Volcano in Costa Rica.
Vulcanian: Tall eruption columns, often exceeding 20km, with pyroclastic flows and ash falls, like Paricutin volcano in Mexico.
Plinian: Highly explosive eruption of gases and pyroclastic materials, extremely powerful. Examples include Mount Pinatubo.

Signs of Impending Eruptions

Increased volcanic tremors.
Increased steaming activity.
Crater glow.
Drying up of vegetation around the slopes.
Ground swelling.
Variation in chemical content of springs/wells.
Development of new thermal areas.
Changes in temperature of springs/wells/crater lakes.

Additional Notes

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) is the agency tasked with monitoring volcanoes in the Philippines.
Volcanoes provide clues about the Earth's interior.

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Description

This quiz covers the different types of volcanoes as outlined in the Earth and Space module for Grade 9 Science. Students will explore key concepts such as the structure and parts of a volcano, including the summit, slopes, and magma chamber. Test your understanding of volcanic activity and its features.